On return, EDX contains a symbol result and ECX:EAX contains the value.

返回结果： EDX 包含符号解析的结果， ECX:EAX 值

符号解析结果：

0 EVAL_SYMBOL_VALID ECX:EAX 值无效

1 EVAL_SYMBOL_INVALID 符号无效。在Evalate返回之前 eax不会被改变

2 EVAL_SYMBOL_FORWARD_REFERENCE
当前符号无效，但是如果计算标志允许，后面也许会被赋值。

*-----------------*
* 支持的操作 *
*-----------------*

下面是可以支持的运算，简单的介绍和该操作的类型。

注意：对于整数和浮点数，位操作是等价的，布尔预算和比较运算返回值为全1或者全0.

Note that bitwise operators behave identically for integer and floating-
point evaluation, and boolean and comparison operators return all bits
set. Boolean operators treat floating-point numbers as non-zero if they
are normal, denormalised or infinity. NaN and unnormal are treated as zero.